Riveting device



Nov. 19, 1940. E. BECKER RIVETING DEVICE Filed Nov. 25, 1938 E MIL BECHERINVEA/ITOR/ A TORNEY Patented Nov. 19, 1940 2,221,830 QRIVETING DEVICE Emil Becker, Munich, Germany Application November 25,.1938, Serial No. 242,347 In Germany April 1, 1938 3 Claims.

The invention relates to a riveting device which permits of satisfactorily riveting hollow structures or articles the interiors of which are not readily accessible for the reception of the usual riveting anvil or end stake. It consists essentially in a bar rigidly mounted at one end or supported at both ends and containing an accumulation of mass which constitutes an anvil upon which the riveting takes place. This accumulation of mass, which is hereinafter referred to as the anvil, includes a support, adjustable in height, carrying the parts to be riveted. In this way the parts to be riveted can be'raised sufficiently far from the anvil to allow the inserted rivet to project from its hole whereby such projecting rivet end can be riveted over. The adjustable support is gradually decreased in height during the riveting process.

The advantages of the device will be apparent from the following description and the accompanying drawing in which:

Figure 1 is a side elevation of a riveting device constructed in accordance with this invention and shown as applied to the riveting of a hollow structure;

Figure 2 is a cross-sectional view on the line 22, Figure 1; and

Figure 3 is a perspective view of a table supporting the device and the material being riveted.

Like characters of reference refer to like parts throughout the specification and drawing.

Figure 3 of the drawing shows a table which is fitted with rollers ll carrying the work IS in which the sheets ll, l8 and end piece I9 are being riveted together. At one end of the table is a bracket l which rigidly supports a bar 2, the free end of the bar containing an accumulationof mass to form an anvil 3. The length of the bar 2 will depend on the size of the sheets being riveted together.

Various means may be employed for supporting the work in a position above the anvil to permit the rivet 20 to be inserted into the rivet hole and then lower the Work as the rivet shortens during riveting. Figure 1 illustrates a simple construction by which this may be accomplished.

In Figure l the adjustable supporting device consists of a cam-like member 4 set into the anvil and mounted for rotative movement, a lever 5 connected to the member and means for actuating said lever to rotate said member. The means for actuating the lever consists of a spring l5 which urges the lever 5 in one direction and a cable 6 carried in the tube 8 which moves the lever against the tension of the spring. The tube is provided with a handle 9 and a lever l to which is connected the cable 6. The member dhas a flattened surface which is arranged to lie even with the head forming surface of the anvil so that no obstruction will be presented to prevent the rivet passing over the anvil when the work is moved to bring another rivet into place for forming the head. By rotating the member ll the work will be raised from the upper face of the anvil 3 and also raised from off the rollers ll.

The rivet is inserted in the hole and'projects downwardly to contact the upper face of the anvil. The member supports the work and gradually lowers it during riveting so that the shortened rivet is always kept incontactv with the anvil.

for use in riveting together light-gauge metal sheets, particularly in the formation of cellular structures, and it is to be understood that the rivets are generally of smalldiameter, that is, in the vicinity of one-eighth to one-sixteenth of an inch. It is also to be understood that the riveting of each rivet takes only a small fraction of time measurable in seconds, and ispreferably performed With a rapidly vibrating hammer device. In practice, the inserted rivets are headed so rapidly that the decreasing height movement of the adjustable work support somewhat approaches the falling movement of the sheets I1 and I8 if the cam 4 were instantaneously moved into the lowermost position.

While my drawing and description set out the underlying principle and practice of my invention, it is to be understood that further refinements in this construction can be made without departing from the spirit of my invention as set forth in the appended claims.

What I claim as my invention is:

1. In a riveting device, a bar, an anvil solely supported by the bar and having'in itself sufficient mass to withstand riveting blows, aro tatably supported cam member .for maintaining the material being riveted in spaced relation to the anvil, said cam member having such a contour that as the cam is rotated the distance between the material and the rivet end contacting face of the anvil is reduced as the anvil and material approach one another as therivet shortens during the riveting process. 2. In ariveting device, a bar, an anvil solely supported by the bar and having in itself sufficient mass to withstand riveting blows, a rotat- My riveting apparatus is primarily designed supported by the bar and having in itself sufficient mass to withstand riveting blows, a rotatably supported cam member for maintaining the material being riveted in spaced relation to the anvil, said cam member having a flat face that lies substantially flush with the rivet contactin face of the anvil when the cam is in one adjusted position, the cam being adapted to rise above the rivet contacting face of the anvil when moved into another adjusted position, a swingable lever for rotating the cam member, means for actuating said lever, said cam member having such a contour that as the cam is rotated the distance between the material and the rivet end contacting face of the anvil is reduced as the anvil and material approach one another as the rivet shortens during the riveting process.

EMIL BECKER. 

